periods
参考词典中periods的常规释义：
基本释义
- n. 周期
参考例句
- We have four periods of English a week.
我们每星期上四节英语课。 - Her periods did not appear.
她月经没来。 - The country enters a period of stagnation.
这个国家进入了经济停滞时期。 - The Qin dynasty existed for a very short period.
秦朝存在的时间很短。 - I think the loan must be repaid within a three-year period.
我认为贷款必须在三年内偿还。
- We have four periods of English a week.
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